RV Investigator Voyage IN2025_V04 SBP29 Sub-bottom Profiler Data

This record describes sub bottom profiler data collected on RV Investigator voyage IN2025_V04, ['Untangling the causes of change over 25 years in the southeast marine ecosystem - Voyage IV'] which departed Hobart on 27/05/2025 and returned to Hobart on 28/06/2025.The Kongsberg SBP29 (sub bottom profiler) was used to acquire data containing the specular reflections at different sediment interfaces below the seafloor. The SBP29 provides a 3° by 3° angular resolution.The echosounder's frequency sweep range is from 2 to 9 kHz. The SBP29 was logged continuously on the shelf for the extent of the voyage.Data are stored in *.raw (1,111 files 26.7 GB) raw and *.seg (1,094 files 26.3 GB) segy formats at CSIRO.The segy format data had a real time processing stream applied, which applies gain, a gain correction, matched filter with replica shaping, an attribute calculation for instantaneous amplitude and time variable gain.Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request